//package org.wzq;
//
//import org.apache.hadoop.conf.Configuration;
//import org.apache.hadoop.fs.Path;
//import org.apache.hadoop.io.IntWritable;
//import org.apache.hadoop.io.Text;
//import org.apache.hadoop.mapreduce.Job;
//import org.apache.hadoop.mapreduce.Mapper;
//import org.apache.hadoop.mapreduce.Reducer;
//import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
//import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
//import org.apache.hadoop.util.GenericOptionsParser;
//
//import java.io.IOException;
//
//public class WordCount {
//
//    public static class MyMapper extends Mapper<Object, Text, Text, IntWritable> {
//        private final static IntWritable one = new IntWritable(1);
//        private Text event = new Text();
//
//        public void map(Object key, Text value, Context context)
//                throws IOException, InterruptedException {
//            int idx = value.toString().indexOf(" ");
//            if (idx > 0) {
//                String e = value.toString().substring(0, idx);
//                event.set(e);
//                context.write(event, one);
//            }
//        }
//    }
//
//    public static class MyReducer extends Reducer<Text, IntWritable, Text, IntWritable> {
//        private IntWritable result = new IntWritable();
//
//        public void reduce(Text key, Iterable<IntWritable> values, Context context)
//                throws IOException, InterruptedException {
//            int sum = 0;
//            for (IntWritable val : values) {
//                sum += val.get();
//            }
//            result.set(sum);
//            context.write(key, result);
//        }
//    }
//
//    public static void main(String[] args) throws Exception {
//        Configuration conf = new Configuration();
//        String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
//        if (otherArgs.length < 2) {
//            System.err.println("Usage: EventCount <in> <out>");
//            System.exit(2);
//        }
//        Job job = Job.getInstance(conf, "event count");
//        job.setJarByClass(WordCount.class);
//        job.setMapperClass(MyMapper.class);
//        job.setCombinerClass(MyReducer.class);
//        job.setReducerClass(MyReducer.class);
//        job.setOutputKeyClass(Text.class);
//        job.setOutputValueClass(IntWritable.class);
//        FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
//        FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
//        System.exit(job.waitForCompletion(true) ? 0 : 1);
//    }
//}